Two Bills, I would suggest using the timing light and the timing is adjusted with the Throttle Position Sensor Disconnected, This also allows you to adjust the Base Idle. Mine was 100 RPM to High.

Ear tuning is what we all did on our older vehicles, but with the Computer adjusting for your moves, you may have created more problems. I did disconnect my Battery to reset the Computer however I didn't notice any difference afterwards. I'm actually thinking of Retarding further to use Mid grade or regular fuels. I'll let you know how it works out.

I just received my BR-3 Scan tool and love it, but didn't have my X to try it out on. It was at the Dealer getting a new Steering Gear Box.

Good luck, Adam